CN102786822A - Natural mineral-based high-temperature anti-oxidation decarbonization coating - Google Patents

Natural mineral-based high-temperature anti-oxidation decarbonization coating Download PDF

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CN102786822A
CN102786822A CN2012102929225A CN201210292922A CN102786822A CN 102786822 A CN102786822 A CN 102786822A CN 2012102929225 A CN2012102929225 A CN 2012102929225A CN 201210292922 A CN201210292922 A CN 201210292922A CN 102786822 A CN102786822 A CN 102786822A
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coating
water
percent
natural mineral
mgo
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刘斌
姚义俊
沈国柱
苏义
盛群
楼之栋
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Nanjing University of Information Science and Technology
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Nanjing University of Information Science and Technology
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Abstract

The invention discloses a natural mineral-based high-temperature anti-oxidation decarbonization coating. According to coating dry powder, the coating comprises the following components in percentage by weight: 15 to 35 percent of Al2O3, 35 to 55 percent of SiO2, 2 to 12 percent of Fe2O3, 2 to 10 percent of MgO, 3 to 10 percent of C, 5 to 20 percent of Na2O, 0 to 5 percent of CaO, 0 to 5 percent of K2O, and water which enables the density of the final coating slurry to be 1,100 to 1,500kg/m<3>. After the raw materials are weighed according to proportions, the water is added into the raw materials, the mixture is ground by a ball mill, the mixture is sieved by a 200-mesh sieve, and a binding agent, i.e. sodium water glass, and water are added into the mixture until the final density of slurry is adjusted to 1,100 to 1,500kg/m<3>. The coating can be directly coated onto the surface of a steel material to form a protecting layer, the oxidation burning loss of the steel material in a heating process can be obviously reduced, the surface quality of the steel material is improved, the cost is low, and the preparation process is simple.

Description

A kind of high-temp antioxidizing decarburizing coating based on natural mineral
Technical field
The invention belongs to high-temp antioxidizing decarburizing coating technical field, be specifically related to a kind of high-temp antioxidizing decarburizing coating based on natural mineral.
Background technology
The harm of oxidation and decarburization is very serious in the iron and steel heat treatment process, usually because the burn out rate that steel heat-processed generation oxidation causes up to 0.5 ~ 2.5%, this oxidization burning loss has not only reduced lumber recovery, also can influence the surface quality of steel.In the method for existing anti-iron and steel high temperature oxidation decarburization; The method of most convenient economy is to apply anti-oxidation decarburizing coating at steel surface to form resist; Stop the oxidation/decarburization of steel surface when heating, this resist is peeled off, reduce the thickness of iron scale; Reach the raising lumber recovery, improve the purpose of surface quality of steel.This also requires used coating can form the protective layer of complete densification at steel surface, and also should be easy to peel off with protection at the steel rear oxidation iron sheet of coming out of the stove, and attenuate iron scale as far as possible, makes the steel surface after the thermal treatment still keep original metallic gloss.This domestic and international researcher has been carried out a large amount of research.The aluminium of Japan company of Nippon Steel development is that anti-oxidation decarburizing coating is used for special steel, and oxidization burning loss has reduced nearly 90%; The NALCO84MB264 coating of U.S. NALCO chemical company development can make the oxidization burning loss of steel reduce about 80%.The blank plates of silicon steels oxidation preventive coating for heating of domestic Wuhan Iron and Steel Plant development can reduce the oxidization burning loss 70% of steel; The high-temp antioxidizing steel billet coating material of Baogang's development is used for soft steel, and coating can make steel billet degree of oxidation in stove reduce 40-60%.Though it is effective that these coating are protected, price is high, and the ubiquity of application is not high, and Chinese patent CN101760599 announces is used for steel billet anti-oxidation coating material, has reduced the steel plate oxidization burning loss effectively, has improved plate surface quality.But the magnesium chromium matter in the coating influences the globality of coating because the volume unstable causes coating at the use cracking phenomena easily, has reduced oxidation-protective effect.Chinese patent CN1036396 is with common magnesia; Clay silicate frit, industrial chromium sesquioxide and tripoly phosphate sodium STPP are the antioxidizing paint of main raw material, coating has obtained anti-oxidation preferably scaling loss effect on silicon steel sheet; But the deficiency that exists is that clay silicate frit need burn till in advance; And contain the higher zirconium white composition of price, cause complex process, cost is higher.Though the anti-oxidation decarburizing coating of patent CN101426938 and 200610076257.0 all is main raw material with the mineral substance, they have added expensive raw materials such as a large amount of chromium sesquioxides and zirconium white respectively, have increased its cost.Therefore study a kind of low price, protect effective anti-oxidation decarburizing coating to have crucial meaning.
Goal of the invention
The present invention is in order to overcome the deficiency in the above-mentioned technology; A kind of high-temp antioxidizing decarburizing coating based on the natural mineral composition is provided; This coating can be painted on steel surface and form protective layer, can significantly reduce the oxidization burning loss in the steel heat-processed, improves surface quality of steel; And cost is low, and preparation technology is simple.
Technical scheme
In order to achieve the above object, the present invention provides a kind of anti-oxidation decarburizing coating of steel, is benchmark with this coating dry powder, and the component and the content that comprise are following: Al 2O 3: 15-35wt%, SiO 2: 35-55 wt%, Fe 2O 3: 2-12wt%, MgO:2-10wt%, C:3-10wt%, Na 2O:5-20wt%, CaO:0-5wt%, K 2O:0-5wt%, make final coating slurry density at 1100 ~ 1500kg/m 3Water.
Perhaps, be benchmark with this coating dry powder, the component and the content that comprise are following: Al 2O 3: 15-30wt%, SiO 2: 35-50wt%, Fe 2O 3: 2-6wt%, MgO:2-7wt%, C:3-7wt%, Na 2O:5-15wt%, CaO:0.5-5wt%, K 2O:0.5-5wt%, make final coating slurry density at 1100 ~ 1500kg/m 3Water.
With this coating dry powder is benchmark, and the component and the content that comprise are following: Al 2O 3: 20-30wt%, SiO 2: 35-45wt%, Fe 2O 3: 3-6wt%, MgO:3-7wt%, C:3-7wt%, Na 2O:5-10wt%, CaO:1-5wt%, K 2O:1-5wt%, make final coating slurry density at 1100 ~ 1500kg/m 3Water.
With this coating dry powder is benchmark, and the component and the content that comprise are following: Al 2O 3: 20-25wt%, SiO 2: 35-40wt%, Fe 2O 3: 3-5wt%, MgO:3-6wt%, C:5-7wt%, Na 2O:10-20wt%, CaO:2-5wt%, K 2O:2-5wt%, make final coating slurry density at 1100 ~ 1500kg/m 3Water.The preparation technology of anti-oxidation decarburizing coating comprises the steps:
A. take by weighing bauxitic clay in proportion, attapulgite, sodium bentonite and graphite behind the thorough mixing, add an amount of water, put into the aluminum oxide ball milling jar of ball mill, 180r/min ball milling 10 minutes; As preferably, said graphite is flake graphite.
B. the slurry hygrometric state of ball milling is crossed 200 mesh sieves, get sieve slurry down, add the sticker sodium silicate, and add remainder water, make the final densities of regulating slurry at 1100 ~ 1500kg/m 3High-speed stirring is even, promptly obtains target coating.
Beneficial effect:
(1) above-mentioned Al is provided 2O 3, SiO 2, Fe 2O 3, MgO, Na 2, CaO, K 2The raw material of O composition is a zeopan natural mineral bauxitic clay, and attapulgite and sodium bentonite have higher dispersiveness, high thermal resistance and rheological, and have certain cohesive force, and dry shrinkage is little, and is not easy to crack, cheap.Be to be final purpose with the chemical ingredients that requirement is provided.Because the difference of different minerals stock yard composition has the different raw materials proportioning when selecting different raw mineral materialss for use, prerequisite is to satisfy the composition of above-mentioned main chemical composition, and other minor component can be ignored.And the Graphite Powder 99 that adds is a carbon source, can play the effect of taking oxygen by force, and the oxygen level in the process furnace is obviously reduced, and reduces decarburization.Graphite has laminate structure simultaneously, and high-temperature stability is arranged, and thermal expansivity is very little, and thermal shock resistance is good, can reduce the generation of crackle.
(2) high-temp antioxidizing decarburizing coating of the present invention both can spray or brush the surface drying film forming at iron and steel, can be painted on the billet surface of high temperature (below 1000 ℃) again; Under high temperature action; In the time of the system moisture evaporation, function ingredients in the coating and sticker are in matrix surface generation instaneous polymerization bonding, thereby the heat of dependence steel self has formed fine and close coating; Make the high temperature oxidation scaling loss of steel billet reduce by 55 ~ 80%; And do not change original performance of steel billet matrix, and having improved slab lumber recovery and output greatly, economic and social benefit is considerable.
(3) antioxidizing paint of the present invention is applicable to anti-oxidation when the heating in 800 ~ 1300 ℃/2 ~ 10 hours of multiple steel such as plain carbon stool and various steel alloy, and coating is very easily peeled off after the thermal treatment, and the metallic surface is smooth, does not have decarburization and alloying element leakage.In heat treatment process, coating and matrix surface form the resist of compact and firm, have prevented the infiltration of extraneous oxidizing gas effectively, have stoped the oxidation and the decarburization of matrix surface.Because coating is in sintered state from start to finish; Sticker in the system seals steel surface through the function ingredients that pyroprocess firmly fetters other intactly, and the feasible remarkable difference owing to the coated substrate thermal expansivity of the surface cooling process of moment causes coating spontaneous combustion peel-ability to be strengthened after steel billet is come out of the stove.
Embodiment
Below through specific embodiment the preparation process of anti-oxidation decarburizing coating of the present invention is described further, but be not limited thereto.
Embodiment 1
Press dry mash chemical ingredients: Al 2O 3: 15wt%, SiO 2: 55wt%, Fe 2O 3: 3wt%, MgO:3wt%, C:3wt%, Na 2O:20wt%, CaO:0.5wt%, K 2O:0.5wt% takes by weighing bauxitic clay respectively, attapulgite, sodium bentonite, flake graphite, sodium silicate.Add water 180r/min ball milling after 10 minutes, cross 200 mesh sieves, add sodium silicate, high-speed stirring is even.Adding the density that water is adjusted to final slip is 1100kg/m 3, obtain high-temp antioxidizing decarburizing coating of the present invention.
Coating is coated on the surface of 600 ℃ Q235B steel billet, promptly forms one deck grey supercoat.After heat treatment, the iron scale behind the coating protection does not add the obvious attenuate of iron scale of coating protection, and the oxidization burning loss rate reduces more than 60%, and coating can peel off naturally, and matrix surface is evenly bright and clean, noresidue.
Embodiment 2
Press dry mash chemical ingredients: Al 2O 3: 35wt%, SiO 2: 40wt%, Fe 2O 3: 5wt%, MgO:3wt%, C:10wt%, Na 2O:5wt%, CaO:1wt%, K 2O:1wt%.Take by weighing bauxitic clay respectively, attapulgite, sodium bentonite, flake graphite, sodium silicate.Add water 180r/min ball milling after 10 minutes, cross 200 mesh sieves, add sodium silicate, high-speed stirring is even.Adding the density that water is adjusted to final slip is 1500kg/m 3, obtain high-temp antioxidizing decarburizing coating of the present invention.
Coating is coated on the surface of 800 ℃ 30CrMo steel billet, promptly forms one deck grey supercoat.After heat treatment, the iron scale behind the coating protection does not add the obvious attenuate of iron scale of coating protection, and the oxidization burning loss rate reduces more than 70%, and coating can peel off naturally, and matrix surface is evenly bright and clean, noresidue.
Embodiment 3
Press dry mash chemical ingredients: Al 2O 3: 20wt%, SiO 2: 45wt%, Fe 2O 3: 6wt%, MgO:7wt%, C:7wt%, Na 2O:10wt%, CaO:2wt%, K 2O:3wt%.Take by weighing bauxitic clay respectively, attapulgite, sodium bentonite, flake graphite, sodium silicate.Add water 180r/min ball milling after 10 minutes, cross 200 mesh sieves, add sodium silicate, high-speed stirring is even.Adding the density that water is adjusted to final slip is 1400kg/m 3, obtain high-temp antioxidizing decarburizing coating of the present invention.
Coating is coated on the surface of 800 ℃ Q235B steel billet, promptly forms one deck grey supercoat.After heat treatment, the iron scale behind the coating protection does not add the obvious attenuate of iron scale of coating protection, and the oxidization burning loss rate reduces more than 70%, and coating can peel off naturally, and matrix surface is evenly bright and clean, noresidue.
Embodiment 4
Press dry mash chemical ingredients: Al 2O 3: 25wt%, SiO 2: 50wt %, Fe 2O 3: 3wt%, MgO:3wt%, C:3wt%, Na 2O:15wt%, CaO:0.5wt%, K 2O:0.5wt%.Take by weighing bauxitic clay respectively, attapulgite, sodium bentonite, flake graphite, sodium silicate.Add water 180r/min ball milling after 10 minutes, cross 200 mesh sieves, add sodium silicate, high-speed stirring is even.Adding the density that water is adjusted to final slip is 1200kg/m 3, obtain high-temp antioxidizing decarburization of the present invention and be coated with.
Coating is coated on the surface of 1000 ℃ 30CrMo steel billet, promptly forms one deck grey supercoat.After heat treatment, the iron scale behind the coating protection does not add the obvious attenuate of iron scale of coating protection, and the oxidization burning loss rate reduces more than 60%, and coating can peel off naturally, and matrix surface is evenly bright and clean, noresidue.
Embodiment 5
Press dry mash chemical ingredients: Al 2O 3: 30wt%, SiO 2: 35wt%, Fe 2O 3: 6wt%, MgO:6wt%, C:5wt%, Na 2O:10wt%, CaO:4wt%, K 2O:4wt%.Take by weighing bauxitic clay respectively, attapulgite, sodium bentonite, flake graphite, sodium silicate.Add water 180r/min ball milling after 10 minutes, cross 200 mesh sieves, add sodium silicate, high-speed stirring is even.Adding the density that water is adjusted to final slip is 1300kg/m 3, obtain high-temp antioxidizing decarburizing coating of the present invention.
Coating is coated on the surface of 1000 ℃ Q235B steel billet, promptly forms one deck grey supercoat.After heat treatment, the iron scale behind the coating protection does not add the obvious attenuate of iron scale of coating protection, and the oxidization burning loss rate reduces more than 70%, and coating can peel off naturally, and matrix surface is evenly bright and clean, noresidue.
Embodiment 6
Press dry mash chemical ingredients: Al 2O 3: 35wt%, SiO 2: 45wt%, Fe 2O 3: 2wt%, MgO:2wt%, C:5.5wt%, Na 2O:0.5wt%, CaO:5wt%, K 2O:5wt%.Take by weighing bauxitic clay respectively, attapulgite, sodium bentonite, flake graphite, sodium silicate.Add water 180r/min ball milling after 10 minutes, cross 200 mesh sieves, add sodium silicate, high-speed stirring is even.Adding the density that water is adjusted to final slip is 1150kg/m 3, obtain high-temp antioxidizing decarburizing coating of the present invention.
Coating is coated on the surface of 900 ℃ 30CrMo steel billet, promptly forms one deck grey supercoat.After heat treatment, the iron scale behind the coating protection does not add the obvious attenuate of iron scale of coating protection, and the oxidization burning loss rate reduces more than 75%, and coating can peel off naturally, and matrix surface is evenly bright and clean, noresidue.
Embodiment 7
Press dry mash chemical ingredients: Al 2O 3: 32wt%, SiO 2: 40wt%, Fe 2O 3: 12wt%, MgO:10wt%, C:5.5wt%, Na 2O:0.5wt%.Take by weighing bauxitic clay respectively, attapulgite, sodium bentonite, flake graphite, sodium silicate.Add water 180r/min ball milling after 10 minutes, cross 200 mesh sieves, add sodium silicate, high-speed stirring is even.Adding the density that water is adjusted to final slip is 1350kg/m 3, obtain high-temp antioxidizing decarburizing coating of the present invention.
Coating is coated on the surface of 1000 ℃ Q235B steel billet, promptly forms one deck grey supercoat.After heat treatment, the iron scale behind the coating protection does not add the obvious attenuate of iron scale of coating protection, and the oxidization burning loss rate reduces more than 65%, and coating can peel off naturally, and matrix surface is evenly bright and clean, noresidue.
Embodiment described in this specification sheets, its prescription, title that technology is named etc. can be different.Everyly conceive equivalence or the simple change that described structure, characteristic and principle are done, include in the protection domain of patent of the present invention according to patent of the present invention.Person of ordinary skill in the field of the present invention can make various modifications or replenishes or adopt similar mode to substitute described embodiment; Only otherwise depart from structure of the present invention or surmount the defined scope of this claim, all belong to protection scope of the present invention.

Claims (5)

1. the high-temp antioxidizing decarburizing coating based on natural mineral is characterized in that, is benchmark with this coating dry powder, and the component and the content that comprise are following: Al 2O 3: 15-35wt%, SiO 2: 35-55 wt%, Fe 2O 3: 2-12wt%, MgO:2-10wt%, C:3-10wt%, Na 2O:5-20wt%, CaO:0-5wt%, K 2O:0-5wt%, make final coating slurry density at 1100 ~ 1500kg/m 3Water; Composition Al is provided 2O 3, SiO 2, Fe 2O 3, MgO, Na 2O, CaO, K 2The raw material of O is a zeopan natural mineral bauxitic clay, attapulgite and sodium bentonite, and carbon source is a graphite.
2. the high-temp antioxidizing decarburizing coating based on natural mineral according to claim 1 is characterized in that, is benchmark with this coating dry powder, and the component and the content that comprise are following: Al 2O 3: 15-30wt%, SiO 2: 35-50wt%, Fe 2O 3: 2-6wt%, MgO:2-7wt%, C:3-7wt%, Na 2O:5-15wt%, CaO:0.5-5wt%, K 2O:0.5-5wt%, make final coating slurry density at 1100 ~ 1500kg/m 3Water.
3. the high-temp antioxidizing decarburizing coating based on natural mineral according to claim 1 is characterized in that, is benchmark with this coating dry powder, and the component and the content that comprise are following: Al 2O 3: 20-30wt%, SiO 2: 35-45wt%, Fe 2O 3: 3-6wt%, MgO:3-7wt%, C:3-7wt%, Na 2O:5-10wt%, CaO:1-5wt%, K 2O:1-5wt%, make final coating slurry density at 1100 ~ 1500kg/m 3Water.
4. the high-temp antioxidizing decarburizing coating based on natural mineral according to claim 1 is characterized in that, is benchmark with this coating dry powder, and the component and the content that comprise are following: Al 2O 3: 20-25wt%, SiO 2: 35-40wt%, Fe 2O 3: 3-5wt%, MgO:3-6wt%, C:5-7wt%, Na 2O:10-20wt%, CaO:2-5wt%, K 2O:2-5wt%, make final coating slurry density at 1100 ~ 1500kg/m 3Water.
5. based on the preparation method of each described high-temp antioxidizing decarburizing coating based on natural mineral of claim 1-4, it is characterized in that comprising the steps:
A. take by weighing bauxitic clay in proportion, attapulgite, sodium bentonite and graphite behind the thorough mixing, add an amount of water, put into the aluminum oxide ball milling jar of ball mill, grind;
B. the slurry hygrometric state of ball milling is crossed 200 mesh sieves, get sieve slurry down, add the sticker sodium silicate, and add remainder water, make the final densities of regulating slurry at 1100 ~ 1500kg/m 3;
C. high-speed stirring is even, promptly obtains target coating.
CN2012102929225A 2012-08-17 2012-08-17 Natural mineral-based high-temperature anti-oxidation decarbonization coating Pending CN102786822A (en)

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Cited By (11)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN103421362A (en) * 2013-07-19 2013-12-04 吴江龙硕金属制品有限公司 Antioxidant paint and preparation method thereof
CN103864439A (en) * 2012-12-18 2014-06-18 侯伟 Coating formula for graphite crucible for melting aluminum alloy
CN104327555A (en) * 2014-11-25 2015-02-04 南京信息工程大学 Water-based strippable coating and preparation method thereof
CN106381508A (en) * 2016-08-26 2017-02-08 内蒙古五二特种材料工程技术研究中心 Rare-earth molten-salt stirring rod and manufacturing method thereof
CN107189502A (en) * 2017-06-12 2017-09-22 东旭科技集团有限公司 The guard method of coating composition, tin oxide electrode coating and tin oxide electrode
CN111742074A (en) * 2017-12-19 2020-10-02 安赛乐米塔尔公司 Coated steel substrate
CN113025094A (en) * 2021-03-10 2021-06-25 桂林理工大学 Antioxidant red mud doped paint for high-temperature steel billet
CN113321519A (en) * 2021-06-25 2021-08-31 北京航空航天大学杭州创新研究院 High-temperature-resistant coating for oxygen lance and preparation method thereof
CN113943501A (en) * 2021-10-27 2022-01-18 上海摩瑟尔科学技术有限公司 High-temperature anti-oxidation protective coating and preparation method thereof
CN114213883A (en) * 2021-12-31 2022-03-22 咸阳非金属矿研究设计院有限公司 Inorganic composite temperature-resistant anticorrosive coating material and preparation method thereof
CN116144204A (en) * 2023-03-02 2023-05-23 赵志龙 Separation paint for synthetic mica smelting furnace

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CN102601300A (en) * 2012-03-31 2012-07-25 湖北省机电研究设计院 Sintering-strippable red cast iron coating and preparation method thereof

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CN101195146A (en) * 2007-12-19 2008-06-11 济南圣泉集团股份有限公司 Coal ash casting paint
CN102601300A (en) * 2012-03-31 2012-07-25 湖北省机电研究设计院 Sintering-strippable red cast iron coating and preparation method thereof

Cited By (15)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN103864439A (en) * 2012-12-18 2014-06-18 侯伟 Coating formula for graphite crucible for melting aluminum alloy
CN103421362A (en) * 2013-07-19 2013-12-04 吴江龙硕金属制品有限公司 Antioxidant paint and preparation method thereof
CN104327555A (en) * 2014-11-25 2015-02-04 南京信息工程大学 Water-based strippable coating and preparation method thereof
CN106381508A (en) * 2016-08-26 2017-02-08 内蒙古五二特种材料工程技术研究中心 Rare-earth molten-salt stirring rod and manufacturing method thereof
CN107189502A (en) * 2017-06-12 2017-09-22 东旭科技集团有限公司 The guard method of coating composition, tin oxide electrode coating and tin oxide electrode
CN107189502B (en) * 2017-06-12 2019-04-30 东旭科技集团有限公司 The guard method of coating composition, tin oxide electrode coating and tin oxide electrode
CN111742074A (en) * 2017-12-19 2020-10-02 安赛乐米塔尔公司 Coated steel substrate
CN111742074B (en) * 2017-12-19 2021-09-10 安赛乐米塔尔公司 Coated steel substrate
CN113025094A (en) * 2021-03-10 2021-06-25 桂林理工大学 Antioxidant red mud doped paint for high-temperature steel billet
CN113321519A (en) * 2021-06-25 2021-08-31 北京航空航天大学杭州创新研究院 High-temperature-resistant coating for oxygen lance and preparation method thereof
CN113321519B (en) * 2021-06-25 2022-08-05 北京航空航天大学杭州创新研究院 High-temperature-resistant coating for oxygen lance and preparation method thereof
CN113943501A (en) * 2021-10-27 2022-01-18 上海摩瑟尔科学技术有限公司 High-temperature anti-oxidation protective coating and preparation method thereof
CN114213883A (en) * 2021-12-31 2022-03-22 咸阳非金属矿研究设计院有限公司 Inorganic composite temperature-resistant anticorrosive coating material and preparation method thereof
CN116144204A (en) * 2023-03-02 2023-05-23 赵志龙 Separation paint for synthetic mica smelting furnace
CN116144204B (en) * 2023-03-02 2024-04-12 赵志龙 Separation paint for synthetic mica smelting furnace

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Application publication date: 20121121